This patch add support vhost kernel as the backend for virtio_user.
Three main hook functions are added:
- vhost_kernel_setup() to open char device, each vq pair needs one
vhostfd;
- vhost_kernel_ioctl() to communicate control messages with vhost
kernel module;
- vhost_kernel_enable_queue_pair() to open tap device and set it
as the backend of corresonding vhost fd (that is to say, vq pair).
Signed-off-by: Jianfeng Tan <jianfeng....@intel.com>
---
doc/guides/rel_notes/release_17_02.rst | 20 ++
drivers/net/virtio/Makefile | 2 +
drivers/net/virtio/virtio_user/vhost.h | 2 +
drivers/net/virtio/virtio_user/vhost_kernel.c | 311 ++++++++++++++++++++++
drivers/net/virtio/virtio_user/vhost_kernel_tap.c | 116 ++++++++
drivers/net/virtio/virtio_user/vhost_kernel_tap.h | 60 +++++
drivers/net/virtio/virtio_user/virtio_user_dev.c | 36 ++-
drivers/net/virtio/virtio_user/virtio_user_dev.h | 5 +
8 files changed, 549 insertions(+), 3 deletions(-)
create mode 100644 drivers/net/virtio/virtio_user/vhost_kernel.c
create mode 100644 drivers/net/virtio/virtio_user/vhost_kernel_tap.c
create mode 100644 drivers/net/virtio/virtio_user/vhost_kernel_tap.h
diff --git a/doc/guides/rel_notes/release_17_02.rst
b/doc/guides/rel_notes/release_17_02.rst
index 180af82..7354df5 100644
--- a/doc/guides/rel_notes/release_17_02.rst
+++ b/doc/guides/rel_notes/release_17_02.rst
@@ -52,6 +52,26 @@ New Features
See the :ref:`Generic flow API <Generic_flow_API>` documentation for more
information.
+* **virtio_user with vhost-kernel as another exceptional path.**
+
+ Previously, we upstreamed a virtual device, virtio_user with vhost-user
+ as the backend, as a way for IPC (Inter-Process Communication) and user
+ space container networking.
+
+ Virtio_user with vhost-kernel as the backend is a solution for exceptional
+ path, such as KNI, which exchanges packets with kernel networking stack.
+ This solution is very promising in:
+
+ * maintenance: vhost and vhost-net (kernel) is upstreamed and extensively
+ used kernel module.
+ * features: vhost-net is born to be a networking solution, which has
+ lots of networking related featuers, like multi queue, tso, multi-seg
+ mbuf, etc.
+ * performance: similar to KNI, this solution would use one or more
+ kthreads to send/receive packets from user space DPDK applications,
+ which has little impact on user space polling thread (except that
+ it might enter into kernel space to wake up those kthreads if
+ necessary).
Resolved Issues
---------------
diff --git a/drivers/net/virtio/Makefile b/drivers/net/virtio/Makefile
index 97972a6..8b5b5d6 100644
--- a/drivers/net/virtio/Makefile
+++ b/drivers/net/virtio/Makefile
@@ -60,6 +60,8 @@ endif
ifeq ($(CONFIG_RTE_VIRTIO_USER),y)
SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_user/vhost_user.c
+SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_user/vhost_kernel.c
+SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_user/vhost_kernel_tap.c
SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_user/virtio_user_dev.c
SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_user_ethdev.c
endif
diff --git a/drivers/net/virtio/virtio_user/vhost.h
b/drivers/net/virtio/virtio_user/vhost.h
index 515e4fc..5c983bd 100644
--- a/drivers/net/virtio/virtio_user/vhost.h
+++ b/drivers/net/virtio/virtio_user/vhost.h
@@ -118,4 +118,6 @@ struct virtio_user_backend_ops {
};
struct virtio_user_backend_ops ops_user;
+struct virtio_user_backend_ops ops_kernel;
+
#endif
diff --git a/drivers/net/virtio/virtio_user/vhost_kernel.c
b/drivers/net/virtio/virtio_user/vhost_kernel.c
new file mode 100644
index 0000000..9301f96
--- /dev/null
+++ b/drivers/net/virtio/virtio_user/vhost_kernel.c
@@ -0,0 +1,311 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2016 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <rte_memory.h>
+#include <rte_eal_memconfig.h>
+
+#include "vhost.h"
+#include "virtio_user_dev.h"
+#include "vhost_kernel_tap.h"
+
+struct vhost_memory_kernel {
+ uint32_t nregions;
+ uint32_t padding;
+ struct vhost_memory_region regions[0];
+};
+
+/* vhost kernel ioctls */
+#define VHOST_VIRTIO 0xAF
+#define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64)
+#define VHOST_SET_FEATURES _IOW(VHOST_VIRTIO, 0x00, __u64)
+#define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)
+#define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)
+#define VHOST_SET_MEM_TABLE _IOW(VHOST_VIRTIO, 0x03, struct
vhost_memory_kernel)
+#define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)
+#define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)
+#define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)
+#define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)
+#define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
+#define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct
vhost_vring_state)
+#define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)
+#define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)
+#define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
+#define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
+
+static uint64_t max_regions = 64;
+
+static void
+get_vhost_kernel_max_regions(void)
+{
+ int fd;
+ char buf[20] = {'\0'};
+
+ fd = open("/sys/module/vhost/parameters/max_mem_regions", O_RDONLY);
+ if (fd < 0)
+ return;
+
+ if (read(fd, buf, 20-1) > 0)
+ max_regions = strtoull(buf, NULL, 10);
+
+ close(fd);
+}
+
+static uint64_t vhost_req_user_to_kernel[] = {
+ [VHOST_USER_SET_OWNER] = VHOST_SET_OWNER,
+ [VHOST_USER_RESET_OWNER] = VHOST_RESET_OWNER,
+ [VHOST_USER_SET_FEATURES] = VHOST_SET_FEATURES,
+ [VHOST_USER_GET_FEATURES] = VHOST_GET_FEATURES,
+ [VHOST_USER_SET_VRING_CALL] = VHOST_SET_VRING_CALL,
+ [VHOST_USER_SET_VRING_NUM] = VHOST_SET_VRING_NUM,
+ [VHOST_USER_SET_VRING_BASE] = VHOST_SET_VRING_BASE,
+ [VHOST_USER_GET_VRING_BASE] = VHOST_GET_VRING_BASE,
+ [VHOST_USER_SET_VRING_ADDR] = VHOST_SET_VRING_ADDR,
+ [VHOST_USER_SET_VRING_KICK] = VHOST_SET_VRING_KICK,
+ [VHOST_USER_SET_MEM_TABLE] = VHOST_SET_MEM_TABLE,
+};
+
+/* By default, vhost kernel module allows 64 regions, but DPDK allows
+ * 256 segments. As a relief, below function merges those virtually
+ * adjacent memsegs into one region.
+ */
+static struct vhost_memory_kernel *
+prepare_vhost_memory_kernel(void)
+{
+ uint32_t i, j, k = 0;
+ struct rte_memseg *seg;
+ struct vhost_memory_region *mr;
+ struct vhost_memory_kernel *vm;
+
+ vm = malloc(sizeof(struct vhost_memory_kernel) +
+ max_regions *
+ sizeof(struct vhost_memory_region));
+
+ for (i = 0; i < RTE_MAX_MEMSEG; ++i) {
+ seg = &rte_eal_get_configuration()->mem_config->memseg[i];
+ if (!seg->addr)
+ break;
+
+ int new_region = 1;
+
+ for (j = 0; j < k; ++j) {
+ mr = &vm->regions[j];
+
+ if (mr->userspace_addr + mr->memory_size ==
+ (uint64_t)(uintptr_t)seg->addr) {
+ mr->memory_size += seg->len;
+ new_region = 0;
+ break;
+ }
+
+ if ((uint64_t)(uintptr_t)seg->addr + seg->len ==
+ mr->userspace_addr) {
+ mr->guest_phys_addr =
+ (uint64_t)(uintptr_t)seg->addr;
+ mr->userspace_addr =
+ (uint64_t)(uintptr_t)seg->addr;
+ mr->memory_size += seg->len;
+ new_region = 0;
+ break;
+ }
+ }
+
+ if (new_region == 0)
+ continue;
+
+ mr = &vm->regions[k++];
+ /* use vaddr here! */
+ mr->guest_phys_addr = (uint64_t)(uintptr_t)seg->addr;
+ mr->userspace_addr = (uint64_t)(uintptr_t)seg->addr;
+ mr->memory_size = seg->len;
+ mr->mmap_offset = 0;
+
+ if (k >= max_regions) {
+ free(vm);
+ return NULL;
+ }
+ }
+
+ vm->nregions = k;
+ vm->padding = 0;
+ return vm;
+}
+
+static int
+vhost_kernel_ioctl(struct virtio_user_dev *dev,
+ enum vhost_user_request req,
+ void *arg)
+{
+ int ret = -1;
+ unsigned int i;
+ uint64_t req_kernel;
+ struct vhost_memory_kernel *vm = NULL;
+
+ PMD_DRV_LOG(INFO, "%s", vhost_msg_strings[req]);
+
+ req_kernel = vhost_req_user_to_kernel[req];
+
+ if (req_kernel == VHOST_SET_MEM_TABLE) {
+ vm = prepare_vhost_memory_kernel();
+ if (!vm)
+ return -1;
+ arg = (void *)vm;
+ }
+
+ /* We don't need memory protection here */
+ if (req_kernel == VHOST_SET_FEATURES)
+ *(uint64_t *)arg &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
+
+ for (i = 0; i < dev->max_queue_pairs; ++i) {
+ if (dev->vhostfds[i] < 0)
+ continue;
+
+ ret = ioctl(dev->vhostfds[i], req_kernel, arg);
+ if (ret < 0)
+ break;
+ }
+
+ if (vm)
+ free(vm);
+
+ if (ret < 0)
+ PMD_DRV_LOG(ERR, "%s failed: %s",
+ vhost_msg_strings[req], strerror(errno));
+
+ return ret;
+}
+
+/**
+ * Set up environment to talk with a vhost kernel backend.
+ *
+ * @return
+ * - (-1) if fail to set up;
+ * - (>=0) if successful.
+ */
+static int
+vhost_kernel_setup(struct virtio_user_dev *dev)
+{
+ int vhostfd;
+ uint32_t i;
+
+ get_vhost_kernel_max_regions();
+
+ for (i = 0; i < dev->max_queue_pairs; ++i) {
+ vhostfd = open(dev->path, O_RDWR);
+ if (vhostfd < 0) {
+ PMD_DRV_LOG(ERR, "fail to open %s, %s",
+ dev->path, strerror(errno));
+ return -1;
+ }
+
+ dev->vhostfds[i] = vhostfd;
+ }
+
+ return 0;
+}
+
+static int
+vhost_kernel_set_backend(int vhostfd, int tapfd)
+{
+ struct vhost_vring_file f;
+
+ f.fd = tapfd;
+ f.index = 0;
+ if (ioctl(vhostfd, VHOST_NET_SET_BACKEND, &f) < 0) {
+ PMD_DRV_LOG(ERR, "VHOST_NET_SET_BACKEND fails, %s",
+ strerror(errno));
+ return -1;
+ }
+
+ f.index = 1;
+ if (ioctl(vhostfd, VHOST_NET_SET_BACKEND, &f) < 0) {
+ PMD_DRV_LOG(ERR, "VHOST_NET_SET_BACKEND fails, %s",
+ strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+static int
+vhost_kernel_enable_queue_pair(struct virtio_user_dev *dev,
+ uint16_t pair_idx,
+ int enable)
+{
+ int hdr_size;
+ int vhostfd;
+ int tapfd;
+
+ vhostfd = dev->vhostfds[pair_idx];
+
+ if (!enable) {
+ if (dev->tapfds[pair_idx]) {
+ close(dev->tapfds[pair_idx]);
+ dev->tapfds[pair_idx] = -1;
+ }
+ return vhost_kernel_set_backend(vhostfd, -1);
+ } else if (dev->tapfds[pair_idx] >= 0) {
+ return 0;
+ }
+
+ if ((dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF)) ||
+ (dev->features & (1ULL << VIRTIO_F_VERSION_1)))
+ hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+ else
+ hdr_size = sizeof(struct virtio_net_hdr);
+
+ tapfd = vhost_kernel_open_tap(&dev->ifname, hdr_size);
+ if (tapfd < 0) {
+ PMD_DRV_LOG(ERR, "fail to open tap for vhost kernel");
+ return -1;
+ }
+
+ if (vhost_kernel_set_backend(vhostfd, tapfd) < 0) {
+ PMD_DRV_LOG(ERR, "fail to set backend for vhost kernel");
+ close(tapfd);
+ return -1;
+ }
+
+ dev->tapfds[pair_idx] = tapfd;
+ return 0;
+}
+
+struct virtio_user_backend_ops ops_kernel = {
+ .setup = vhost_kernel_setup,
+ .send_request = vhost_kernel_ioctl,
+ .enable_qp = vhost_kernel_enable_queue_pair
+};
diff --git a/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
new file mode 100644
index 0000000..797713b
--- /dev/null
+++ b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
@@ -0,0 +1,116 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2016 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <errno.h>
+#include <string.h>
+#include <limits.h>
+
+#include "vhost_kernel_tap.h"
+#include "../virtio_logs.h"
+
+int
+vhost_kernel_open_tap(char **p_ifname, int hdr_size)
+{
+ unsigned int tap_features;
+ int sndbuf = INT_MAX;
+ struct ifreq ifr;
+ int tapfd;
+
+ /* TODO:
+ * 1. verify we can get/set vnet_hdr_len, tap_probe_vnet_hdr_len
+ * 2. get number of memory regions from vhost module parameter
+ * max_mem_regions, supported in newer version linux kernel
+ */
+ tapfd = open(PATH_NET_TUN, O_RDWR);
+ if (tapfd < 0) {
+ PMD_DRV_LOG(ERR, "fail to open %s: %s",
+ PATH_NET_TUN, strerror(errno));
+ return -1;
+ }
+
+ /* Construct ifr */
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+
+ if (ioctl(tapfd, TUNGETFEATURES, &tap_features) == -1) {
+ PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
+ goto error;
+ }
+ if (tap_features & IFF_ONE_QUEUE)
+ ifr.ifr_flags |= IFF_ONE_QUEUE;
+
+ /* Let tap instead of vhost-net handle vnet header, as the latter does
+ * not support offloading. And in this case, we should not set feature
+ * bit VHOST_NET_F_VIRTIO_NET_HDR.
+ */
+ if (tap_features & IFF_VNET_HDR) {
+ ifr.ifr_flags |= IFF_VNET_HDR;
+ } else {
+ PMD_DRV_LOG(ERR, "TAP does not support IFF_VNET_HDR");
+ goto error;
+ }
+
+ if (*p_ifname)
+ strncpy(ifr.ifr_name, *p_ifname, IFNAMSIZ);
+ else
+ strncpy(ifr.ifr_name, "tap%d", IFNAMSIZ);
+ if (ioctl(tapfd, TUNSETIFF, (void *)&ifr) == -1) {
+ PMD_DRV_LOG(ERR, "TUNSETIFF failed: %s", strerror(errno));
+ goto error;
+ }
+
+ fcntl(tapfd, F_SETFL, O_NONBLOCK);
+
+ if (ioctl(tapfd, TUNSETVNETHDRSZ, &hdr_size) < 0) {
+ PMD_DRV_LOG(ERR, "TUNSETVNETHDRSZ failed: %s", strerror(errno));
+ goto error;
+ }
+
+ if (ioctl(tapfd, TUNSETSNDBUF, &sndbuf) < 0) {
+ PMD_DRV_LOG(ERR, "TUNSETSNDBUF failed: %s", strerror(errno));
+ goto error;
+ }
+
+ if (!(*p_ifname))
+ *p_ifname = strdup(ifr.ifr_name);
+
+ return tapfd;
+error:
+ close(tapfd);
+ return -1;
+}
diff --git a/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
b/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
new file mode 100644
index 0000000..1fc58ff
--- /dev/null
+++ b/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
@@ -0,0 +1,60 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2016 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/ioctl.h>
+
+/* TUN ioctls */
+#define TUNSETIFF _IOW('T', 202, int)
+#define TUNGETFEATURES _IOR('T', 207, unsigned int)
+#define TUNSETOFFLOAD _IOW('T', 208, unsigned int)
+#define TUNGETIFF _IOR('T', 210, unsigned int)
+#define TUNSETSNDBUF _IOW('T', 212, int)
+#define TUNGETVNETHDRSZ _IOR('T', 215, int)
+#define TUNSETVNETHDRSZ _IOW('T', 216, int)
+#define TUNSETQUEUE _IOW('T', 217, int)
+#define TUNSETVNETLE _IOW('T', 220, int)
+#define TUNSETVNETBE _IOW('T', 222, int)
+
+/* TUNSETIFF ifr flags */
+#define IFF_TAP 0x0002
+#define IFF_NO_PI 0x1000
+#define IFF_ONE_QUEUE 0x2000
+#define IFF_VNET_HDR 0x4000
+#define IFF_MULTI_QUEUE 0x0100
+#define IFF_ATTACH_QUEUE 0x0200
+#define IFF_DETACH_QUEUE 0x0400
+
+/* Constants */
+#define PATH_NET_TUN "/dev/net/tun"
+
+int vhost_kernel_open_tap(char **p_ifname, int hdr_size);
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index 32039a1..ae0824c 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -192,6 +192,9 @@ int virtio_user_stop_device(struct virtio_user_dev *dev)
for (i = 0; i < dev->max_queue_pairs; ++i)
dev->ops->enable_qp(dev, i, 0);
+ free(dev->ifname);
+ dev->ifname = NULL;
+
return 0;
}
@@ -230,7 +233,7 @@ is_vhost_user_by_type(const char *path)
static int
virtio_user_dev_setup(struct virtio_user_dev *dev)
{
- uint32_t i;
+ uint32_t i, q;
dev->vhostfd = -1;
for (i = 0; i < VIRTIO_MAX_VIRTQUEUES * 2 + 1; ++i) {
@@ -238,12 +241,28 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
dev->callfds[i] = -1;
}
+ dev->vhostfds = NULL;
+ dev->tapfds = NULL;
+
if (is_vhost_user_by_type(dev->path)) {
dev->ops = &ops_user;
- return dev->ops->setup(dev);
+ } else {
+ dev->ops = &ops_kernel;
+
+ dev->vhostfds = malloc(dev->max_queue_pairs * sizeof(int));
+ dev->tapfds = malloc(dev->max_queue_pairs * sizeof(int));
+ if (!dev->vhostfds || !dev->tapfds) {
+ PMD_INIT_LOG(ERR, "Failed to malloc");
+ return -1;
+ }
+
+ for (q = 0; q < dev->max_queue_pairs; ++q) {
+ dev->vhostfds[q] = -1;
+ dev->tapfds[q] = -1;
+ }
}
- return -1;
+ return dev->ops->setup(dev);
}
int
@@ -295,7 +314,18 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
*path, int queues,
void
virtio_user_dev_uninit(struct virtio_user_dev *dev)
{
+ uint32_t i;
+
+ virtio_user_stop_device(dev);
+
close(dev->vhostfd);
+
+ if (dev->vhostfds) {
+ for (i = 0; i < dev->max_queue_pairs; ++i)
+ close(dev->vhostfds[i]);
+ free(dev->vhostfds);
+ free(dev->tapfds);
+ }
}
static uint8_t
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.h
b/drivers/net/virtio/virtio_user/virtio_user_dev.h
index 9f2f82e..0d39f40 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
@@ -43,6 +43,11 @@ struct virtio_user_dev {
/* for vhost_user backend */
int vhostfd;
+ /* for vhost_kernel backend */
+ char *ifname;
+ int *vhostfds;
+ int *tapfds;
+
/* for both vhost_user and vhost_kernel */
int callfds[VIRTIO_MAX_VIRTQUEUES * 2 + 1];
int kickfds[VIRTIO_MAX_VIRTQUEUES * 2 + 1];
--
2.7.4
